CN107020894A - Pneumatic tire - Google Patents
Pneumatic tire Download PDFInfo
- Publication number
- CN107020894A CN107020894A CN201611167669.5A CN201611167669A CN107020894A CN 107020894 A CN107020894 A CN 107020894A CN 201611167669 A CN201611167669 A CN 201611167669A CN 107020894 A CN107020894 A CN 107020894A
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- China
- Prior art keywords
- mentioned
- tire
- tyre bead
- height
- radial direction
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
- B60C13/04—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof having annular inlays or covers, e.g. white sidewalls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C15/00—Tyre beads, e.g. ply turn-up or overlap
- B60C15/0009—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion
- B60C15/0027—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion with low ply turn-up, i.e. folded around the bead core and terminating at the bead core
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C15/00—Tyre beads, e.g. ply turn-up or overlap
- B60C15/06—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C15/00—Tyre beads, e.g. ply turn-up or overlap
- B60C15/06—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
- B60C15/0628—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead comprising a bead reinforcing layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C15/00—Tyre beads, e.g. ply turn-up or overlap
- B60C15/06—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
- B60C15/0628—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead comprising a bead reinforcing layer
- B60C15/0653—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead comprising a bead reinforcing layer with particular configuration of the cords in the respective bead reinforcing layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
- B60C2013/005—Physical properties of the sidewall rubber
- B60C2013/006—Modulus; Hardness; Loss modulus or "tangens delta"
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
- B60C2013/005—Physical properties of the sidewall rubber
- B60C2013/007—Thickness
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
- B60C13/04—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof having annular inlays or covers, e.g. white sidewalls
- B60C2013/045—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof having annular inlays or covers, e.g. white sidewalls comprising different sidewall rubber layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C15/00—Tyre beads, e.g. ply turn-up or overlap
- B60C15/06—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
- B60C2015/0614—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead characterised by features of the chafer or clinch portion, i.e. the part of the bead contacting the rim
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C2200/00—Tyres specially adapted for particular applications
- B60C2200/06—Tyres specially adapted for particular applications for heavy duty vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C3/00—Tyres characterised by the transverse section
- B60C3/04—Tyres characterised by the transverse section characterised by the relative dimensions of the section, e.g. low profile
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
The present invention provides pneumatic tire, realizes low-rolling-resistance and high-durability.In this tire (2), sidewall (6) have outer layer (6a) and the la m (6b) of the axially inner side positioned at the outer layer.The loss tangent value of la m (6b) is smaller than the loss tangent value of outer layer (6a).When setting in the radial direction from height of the tyre bead baseline (BBL) untill wheel rim (R) outboard end as Hr, if be (Hi) from height of the tyre bead baseline (BBL) untill la m (6b) medial extremity (46), height (Hi) is more than 0.0 and less than 3.0 with highly the ratio between (Hr) (Hi/Hr).When setting the medial extremity on the border of outer layer (6a) and chafer (8) in the radial direction as (Po), the position consistency of the position of medial extremity (Po) and the outboard end of wheel rim (R) or than the position in the outer part.The position consistency of the outboard end (42) of the position of medial extremity (Po) and the return portion (38) of casingply (34) or than the position in the inner part.
Description
Technical field
The present invention relates to pneumatic tire.In detail, the present invention relates to vehicle as being assemblied in truck, bus etc.
Pneumatic tire for heavy load.
Background technology
Light of environmental concerns, in recent years, the requirement of the low burn consumptionization for vehicle is especially emphasized.Due to tire effect
The burnup performance of vehicle, therefore carry out contributing to the exploitation of " the low burn consumption tire " of the reduction of burnup.Realize tire
Low burn consumptionization, it is important that reduce the rolling resistance of tire.When rolling, tire repeated deformation and recovery.By the deformation and again
Energy loss caused by former is the main producing cause of the rolling resistance of tire.Reduce reduction of the energy loss in rolling resistance
In be important.The reduction energy loss is also required that to sidewall.
There is the tire for reducing the energy loss at sidewall disclosed in Japanese Unexamined Patent Publication 2007-196988 publications.In the wheel
In tire, sidewall turns into the double-layer structure in outer rubber portion and inner rubber portion.By by loss tangent value value than conventional rubber
Small rubber (low heating rubber) constitutes inner rubber portion, so as to reduce rolling resistance.By by loss tangent value value and multiple bullet
Property modular ratio inner rubber portion big rubber constitute outer rubber portion, so as to suppress the reduction of durability.
Patent document 1：Japanese Unexamined Patent Publication 2007-196988 publications
Due to improving the requirement to the low burn consumptionization of vehicle, it is desirable to further reduce rolling resistance.Simultaneously, it is necessary to make tire
Maintain high-durability.
In order to further reduce rolling resistance, it is considered to increase the method for the ratio of low heating rubber used in tire.This
It can be realized by the way that the inner rubber on sidewall is extended into the part of tyre bead.But, it is loaded with the part of tyre bead by wheel rim
Larger load.In order to protect the part of tyre bead, chafer has the complex modulus bigger than sidewall.By complex modulus and
The part that the less inner rubber of loss tangent value value extends to tyre bead can increase the deformation of the part.This can also turn into drop
The reason for durability of the low part.This can cause to reduce the durability of tire.
It is an object of the invention to provide the pneumatic tire of further reduction rolling resistance and the higher durability of realization.
The pneumatic tire of the present invention has：Tyre surface, its outer surface constitutes tread surface；A pair of sidewall, they are respectively from upper
The end for stating tyre surface extends towards radial direction substantially inner side；Chafer, it is respectively in the radial direction on above-mentioned sidewall
Side；A pair of bead, they are located at the axially inner side of above-mentioned chafer respectively；And carcass, it is along above-mentioned tyre surface and above-mentioned tire
It is set up on the inside of side between the tyre bead of a side and the tyre bead of the opposing party, above-mentioned sidewall has outer layer and positioned at the outer layer
The la m of axially inner side, the loss tangent value LTi of above-mentioned la m is smaller than the loss tangent value LTo of above-mentioned outer layer, above-mentioned
The complex modulus Ei of la m*Than the complex modulus Ec of above-mentioned chafer*Small, above-mentioned carcass has casingply,
Above-mentioned casingply is turned back around above-mentioned tyre bead from axially inner side towards outside, thus, is formed with above-mentioned casingply
Principal part and return portion, it is outer from tyre bead baseline BBL to the wheel rim in the radial direction when setting when the tire is assembled into wheel rim
Height untill side is Hr, if from height of the above-mentioned tyre bead baseline BBL untill the medial extremity of above-mentioned la m be Hi when, on
It is more than 0.0 and less than 3.0 to state the ratio between height Hi and above-mentioned height Hr (Hi/Hr), when setting the above-mentioned outer layer and above-mentioned tire
When the medial extremity for enclosing the border of infantees is Po, in the radial direction, above-mentioned medial extremity Po position and the outboard end of above-mentioned wheel rim
Position consistency or than above-mentioned wheel rim outboard end position in the outer part, above-mentioned medial extremity Po position and above-mentioned return portion
The position consistency of outboard end or than above-mentioned return portion outboard end position in the inner part.
Preferably, the ratio between above-mentioned height Hi and above-mentioned height Hr (Hi/Hr) is less than 1.5.
Preferably, when the imaginary line that the radial direction outboard end set from above-mentioned return portion is drawn vertically is Lp, edge should
The thickness Ti of the above-mentioned la m of imaginary line Lp measurements is more than 2mm and below 5mm.
Preferably, the pneumatic tire also has the pad glue turned back around above-mentioned tyre bead, pad glue tool in the outside of above-mentioned carcass
There are the first end of axially inner side positioned at above-mentioned tyre bead and the second axially external end positioned at above-mentioned tyre bead, when setting from tyre bead base
When radial direction of the line untill second end is highly Hf, above-mentioned height Hp and the height Hf difference (Hp-Hf) are more than 6mm
And below 14mm.
Preferably, the ratio between above-mentioned height Hp and above-mentioned height Hr (Hp/Hr) is more than 2 and less than 4.
Preferably, the loss tangent value LT1 of above-mentioned la m is more than 0.02 and less than 0.05.
Preferably, the complex modulus E1 of above-mentioned la m*It is more than 2MPa and below 5MPa.
Inventors the less la m of loss tangent value and loss tangent the value outer layer bigger than la m to being made up of
The structure on sidewall discussed in detail.Its result is, even if finding to extend to la m into the part of tyre bead, by suitable
When the outer layer and the boundary position of chafer on adjustment sidewall, good durability is also able to maintain that.
In the tire of the present invention, sidewall has la m and outer layer.The loss tangent value of la m is than outer layer
Loss tangent value is small.La m is made up of the rubber of low heating.It is outer from tyre bead baseline to the wheel rim in the radial direction when setting
The height of side is Hr, if be Hi from tyre bead baseline to the height of the medial extremity of the la m, height Hi and height Hr it
It is more than 0.0 and less than 3.0 than (Hi/Hr).The la m extends to the part of tyre bead.In the tire, for the low of tire
The ratio of heating rubber is bigger than conventional tire.In the tire, rolling resistance reduction.
The complex modulus of la m is smaller than the complex modulus of chafer.La m is soft.In the tire,
In the radial direction the position consistency of the outboard end of the medial extremity Po on the border of outer layer and chafer position and wheel rim or
Person than the outboard end of wheel rim position in the outer part.The position of the outboard end of medial extremity Po position and the return portion of casingply
The position of outboard end consistent or than return portion is in the inner part.By the structure, even if soft la m extends to tyre bead
Part, also suppresses the deformation of the boundary in outer layer and chafer.In the tire, the part of tyre bead maintains well resistance to
Long property.The excellent in te pins of durability of the tire.
Brief description of the drawings
Fig. 1 is the sectional view of a part for the tire for showing an embodiment of the invention.
Fig. 2 is the amplification view of a part for the tire for showing Fig. 1.
Label declaration
2：Tire；4：Tyre surface；6：Sidewall；6a：Outer layer；6b：La m；8：Chafer；10：Tyre bead；10a：Tyre bead
Core；10b：Triangle rubber；10c：Gasket rubber；12：Carcass；14：Belt；14a：First layer；14b：The second layer；14c：3rd
Layer；14d：4th layer；16：Pad glue；18：Cover glue；20：Inner liner；22：Insulation rubber；24：Cushion；26：Tread surface；28：
Groove；30：Basic unit；32：Coating；34：Casingply；36：Principal part；38：Return portion；40：First end；42：Second end；44：
Outboard end；46：Medial extremity.
Embodiment
It is appropriate referring to the drawings and based on preferred embodiment explaining the present invention below.
Figure 1 illustrates pneumatic tire 2.In Fig. 1, above-below direction is the radial direction of tire 2, and left and right directions is tire
2 axial direction, the direction vertical with paper is the circumference of tire 2.In Fig. 1, single dotted broken line CL represents the equatorial plane of tire 2.Remove
Outside tread pattern, the shape of the tire 2 is symmetrical relative to the equatorial plane.
The tire 2 have tyre surface 4, sidewall 6, chafer 8, tyre bead 10, carcass 12, belt 14, pad glue 16, cover glue
18th, inner liner 20, insulation rubber 22 and cushion 24.The tire 2 is tubeless type tire.The tire 2 is assemblied in truck, public transport
Car etc..The tire 2 is the pneumatic tire 2 of heavy load.
Tyre surface 4 is in the shape of the protrusion towards on the outside of radial direction.Tyre surface 4 is formed with the tread surface 26 contacted with road surface.
Groove 28 is carved with tread surface 26.Tread pattern is formed with using the groove 28.Tyre surface 4 has basic unit 30 and coating 32.Cover
Cap rock 32 is located on the outside of the radial direction of basic unit 30.Coating 32 is laminated in basic unit 30.Basic unit 30 is by crosslinking excellent in adhesion
Rubber is constituted.The typical substrate rubber of basic unit 30 is natural rubber.Coating 32 is by wear resistance, heat resistance and adherence properties
Excellent crosslinking rubber is constituted.
Sidewall 6 extends from the end of tyre surface 4 towards radial direction substantially inner side.As shown in figure 1, sidewall 6 is by outer layer 6a
Constituted with la m 6b.
A part for the outer surface of outer layer 6a formation tires 2.Outer layer 6a is located at the axially external of la m 6b.Outside
Layer 6a radial direction medial extremity is nearby contacted with chafer 8.Outer layer 6a is by the resistance to traumatic and excellent friendship of against weather
Join rubber to constitute.
La m 6b is located at outer layer 6a axially inner side.La m 6b is contacted with outer layer 6a axially inner side face.It is interior
Side layer 6b radial direction medial extremity is located at the axially external of tyre bead 10.La m 6b radial direction medial extremity is located at tyre bead bag
The axially inner side of cloth 8.
Outer layer 6a and la m 6b are soft compared with chafer 8.Outer layer 6a complex modulus Eo*With it is interior
Side layer 6b complex modulus Ei*Than the complex modulus Ec of chafer 8*It is small.Soft outer layer 6a and la m 6b has
Help good taking sense.
In the tire 2, la m 6b loss tangent value value LTos of the loss tangent value value LTi than outer layer 6a is small.It is interior
Side layer 6b is made up of the rubber of low heating.
In the present invention, above-mentioned loss tangent value LTi and LTo and complex modulus Ei*、Eo*And Ec*It is foundation
" JIS K 6394 " regulation is measured using viscoplasticity spectrometer (this making of rock made " VESF-3 ") under conditions of following
's.
Initial deformation：10%
Amplitude：± 2.0%
Frequency：10Hz
Deformation pattern：Stretching
Determine temperature：30℃
Chafer 8 is located at outer layer 6a radial direction substantially inner side.Chafer 8 is in the axial direction than tyre bead 10 and tire
Body 12 is in the outer part.When tire 2 is assembled into wheel rim, the chafer 8 is abutted with wheel rim.Tyre bead 10 is protected using the abutting
Vicinity.Therefore chafer 8 is hard compared with sidewall 6.Chafer 8 by excellent in wear resistance crosslinking rubber structure
Into.The complex modulus Ec of chafer 8*It is more than 10MPa and below 90MPa.
Tyre bead 10 is located on the inside of the radial direction on sidewall 6.Tyre bead 10 has：Bead core 10a, from bead core 10a directions
The triangle rubber 10b of extension, the gasket rubber 10c extended from triangle rubber 10b towards radial direction outside on the outside of radial direction.Tire
It is ring-type to enclose core 10a.Bead core 10a includes many non-telescoping lines.Triangle rubber 10b is towards tapered on the outside of radial direction.Triangle
Glue 10b is made up of the crosslinking rubber of high rigidity.Gasket rubber 10c is towards tapered on the outside of radial direction.Gasket rubber 10c is soft
's.Gasket rubber 10c relaxes the stress concentration on the end of carcass 12.
Carcass 12 is made up of casingply 34.Casingply 34 is erected between the tyre bead 10 of both sides, and along tire
Face 4 and the inner side on sidewall 6.Casingply 34 is turned back around bead core 10a from axially inner side towards outside.Turned back by this,
Principal part 36 and return portion 38 are formed with casingply 34.
Although not shown, casingply 34 covers rubber by multiple cords arranged side by side and top and constituted.Each cord is relative to equator
The absolute value of face angulation is from 45 ° to 90 °, more preferably from 75 ° to 90 °.In other words, the carcass 12 has radial junction
Structure.Cord is made up of steel.Carcass 12 can also be formed by the casingply 34 of more than 2.
With in the section for cutting tire 2 perpendicular to circumferential face, belt 14 extends in the axial direction.Belt 14 is half
It is located at the inner side of tyre surface 4 on the direction of footpath.The belt 14 is located on the outside of the radial direction of carcass 12.Belt 14 enters to carcass 12
Row is strengthened.In the tire 2, belt 14 is made up of first layer 14a, second layer 14b, third layer 14c and the 4th layer of 14d.
In the tire 2, in the axial direction, second layer 14b end is located at the position of end in the outer part than first layer 14a
Put.In the axial direction, second layer 14b end is located at the position of end in the outer part than third layer 14c.In the axial direction, this
Two layers of 14b end is located at the position of end in the outer part than the 4th layer of 14d.In the tire 2, the of belt 14 is being constituted
In one layer of 14a, second layer 14b, third layer 14c and the 4th layer of 14d, second layer 14b has maximum width.In the tire 2
In, second layer 14b end is the end of belt 14.
Although not shown, first layer 14a, second layer 14b, third layer 14c and the 4th layer of 14d are respectively by multiple curtains arranged side by side
Rubber composition is covered on line and top.Each cord is made up of steel.The cord is tilted relative to the equatorial plane.The cord relative to the equatorial plane institute into
The absolute value of angle be from 15 ° to 70 °.
Pad glue 16 is turned back around tyre bead 10.Pad glue 16 is turned back around the bead core 10a of tyre bead 10.Pad glue 16 is laminated in carcass ply
Layer 34.Padding glue 16 has the first end 40 for the axially inner side for being located at tyre bead 10 and the second axially external end positioned at tyre bead 10
42.Pad glue 16 covers rubber by multiple cords arranged side by side and top and constituted.Each cord is made up of steel.The pad glue 16 is also referred to as steel pad
Glue.Pad glue 16 can aid in the durability of tire 2.
Cover glue 18 and be presented axially in position than triangle rubber 10b in the outer part.As shown in the drawing, the covering carcass of glue 18 is covered
The end 44 of the return portion 38 of layer of cloth 34.
Inner liner 20 constitutes the inner surface of tire 2.Inner liner 20 is made up of crosslinking rubber.Inner liner 20 is covered using air
The excellent rubber of property.The typical substrate rubber of inner liner 20 is butyl rubber or halogenated butyl rubber.Inner liner 20 is kept
The internal pressure of tire 2.
Insulation rubber 22 is located at the outside of inner liner 20.Insulation rubber 22 is located at the inner side of carcass 12.Insulation rubber 22 is by carcass 12
Clamped with inner liner 20.Insulation rubber 22 is made up of the crosslinking rubber of cementability well.Insulation rubber 22 is securely engaged with carcass 12,
Also it is securely engaged with inner liner 20.Suppress stripping of the inner liner 20 from carcass 12 using insulation rubber 22.
Cushion 24 is laminated near the end of belt 14 with carcass 12.Cushion 24 is by soft crosslinking rubber structure
Into.Cushion 24 absorbs the stress of the end of belt 14.Suppress the tilting of belt 14 using the cushion 24.
Fig. 2 is the amplification view of the Fig. 1 for the part for showing tyre bead 10 tire 2.In fig. 2, above-below direction is radius
Direction, left and right directions is that axially, the direction vertical with paper is circumferential.In fig. 2, the tire 2 is installed on wheel rim R.Solid line
BBL represents tyre bead baseline.The line of rim diameters (with reference to JATMA) of the tyre bead baseline BBL equivalent to regulation wheel rim R.Tyre bead base
Line BBL extends in the axial direction.
As shown in Fig. 2 la m 6b extends to the attached of the bead core 10a of tyre bead 10 between tyre bead 10 and chafer 8
Closely.In fig. 2, two arrow Hi are the radial direction height untill la m 6b medial extremity 46 from tyre bead baseline BBL.Two arrows
Head Hr is the radial direction height untill the outboard end of wheel rim R flange from tyre bead baseline BBL.In the tire 2, height Hi
It is more than 0.0 and less than 3.0 with the ratio between height Hr (Hi/Hr).When ratio (Hi/Hr) is 0.0, la m 6b medial extremity 46
It is placed exactly on tyre bead baseline BBL.
In fig. 2, label Po is outer layer 6a and the radial direction medial extremity on the border of chafer 8.Two arrow Ho are
Radial direction height untill tyre bead baseline BBL to medial extremity Po.In the tire 2, height Ho is more than height Hr.That is,
In the radial direction, the position consistency of the outboard end of medial extremity Po position and wheel rim or the position than the outboard end of wheel rim are leaned on
Outside.
In fig. 2, two arrow Hp be from tyre bead baseline BBL untill the outboard end 44 of the return portion 38 of casingply 34
Radial direction height.In the tire 2, height Ho is below height Hp.I.e., in the radial direction, medial extremity Po position
With the position consistency of the outboard end 44 of return portion 38 or than return portion 38 outboard end 44 position in the inner part.
Illustrate the action effect of the present invention below.
In the tire 2 of the present invention, sidewall 6 has la m 6b and outer layer 6a.La m 6b loss tangent value LTi
Loss tangent value LTo than outer layer 6a is small.La m 6b is made up of low heating rubber.From tyre bead baseline BBL to la m 6b
Medial extremity 46 untill radial direction height Hi with it is high from radial directions of the tyre bead baseline BBL untill the outboard end of the wheel rim
It is less than 3.0 to spend the ratio between Hr (Hi/Hr).La m 6b extends to the part of tyre bead 10.In the tire 2, low heating rubber
Ratio it is bigger than conventional tire 2.The tire 2 reduces rolling resistance.In addition, in the tire 2, the ratio (Hi/Hr) is 0.0
More than.This suppresses the pad glue 16 and the generation of the deformation of the boundary of chafer 8 near on the inside of the radial direction of tyre bead 10.This
Help to realize the good durability of the part of tyre bead 10.
Preferred ratio (Hi/Hr) is less than 1.5.Ratio (Hi/Hr) is that less than 1.5 la m 6b further reduces rolling
Resistance.In addition, la m 6b medial extremity 46 can be sufficiently far from the outboard end 44 of return portion 38.This is favorably improved tyre bead
The durability of 10 part.From this viewpoint, more preferably ratio (Hi/Hr) is less than 1.3.Preferred ratio (Hi/Hr) is 0.2
More than.Ratio (Hi/Hr) is that more than 0.2 la m 6b more effectively suppresses the change of pad glue 16 and the boundary of chafer 8
The generation of shape.
In the tire 2, from tyre bead baseline BBL to the outer surface of the tire 2 on outer layer 6a and chafer 8 side
Height Ho untill boundary is more than the radial direction height Hr untill the outboard end of flange from tyre bead baseline BBL.When the tire 2
When being assembled into wheel rim, chafer 8 and wheel rim R Hp contacts.Outer layer 6a not with Hp contacts.The part of the tyre bead 10
Maintain good durability.In the tire 2, height Ho is than from tyre bead baseline BBL to the return portion 38 of casingply 34
Radial direction height Hp untill outboard end 44 is small.Thus, outer layer 6a when to the part imposed load of tyre bead 10 is suppressed
With the deformation of the boundary of chafer.By the structure, even if soft la m 6b extends to the part of tyre bead 10, tyre bead
10 part also maintains good durability.The excellent in te pins of durability of the tire 2.
In fig. 2, solid line Lp is from the outboard end 44 of the return portion 38 of casingply 34 to axially extending imaginary line.
Two arrow Ti are the thickness along the imaginary line Lp la m 6b measured.That is, thickness Ti is the la m 6b measured along solid line Lp
The distance of medial surface and lateral surface.Preferred thickness Ti is more than 2.0mm.Thickness Ti be more than 2.0mm la m 6b effectively
Contribute to the reduction of rolling resistance.From this viewpoint, more preferably thickness Ti is more than 2.5mm.
Preferred thickness Ti is below 5.0mm., can in the tire 2 with thickness Ti for below 5.0mm la m 6b
Suitably ensure the rigidity of the part of tyre bead 10.Thus, the part of tyre bead 10 maintains good durability.From this viewpoint,
More preferably thickness Ti is below 4.5mm.
In fig. 2, solid line Le is from the outboard end of triangle rubber to axially extending imaginary line.Two arrow Te are along imaginary line
The la m 6b of Le measurements thickness.That is, thickness Te is the medial surface and lateral surface along the imaginary line Le la m 6b measured
Distance.Preferred thickness Te is more than 2.0mm.The la m 6b that thickness Te is more than 2.0mm contributes effectively to rolling resistance
Reduction.From this viewpoint, more preferably thickness Te is more than 2.5mm.
Preferred thickness Te is below 6.0mm., can in the tire 2 with thickness Te for below 6.0mm la m 6b
Suitably ensure outer layer 6a thickness.The sidewall 6 has well resistance to traumatic.From this viewpoint, more preferably thickness Te
It is below 5.5mm.
In fig. 2, point Pm is the point of the width maximum of the tire 2 on the outer surface of the tire 2.Solid line Lm be from point Pm to
Axially extending imaginary line.Two arrow Tm are the medial surface and the distance of lateral surface along the imaginary line Lm la m 6b measured.Change
Yan Zhi, this is the thickness of the la m 6b on the Breadth Maximum position of tire 2.Preferred thickness Tm is more than 1.0mm.Thickness Tm
It is that more than 1.0mm la m 6b contributes effectively to the reduction of rolling resistance.From this viewpoint, more preferably thickness Tm is
1.5mm more than.
Preferred thickness Tm is below 4.0mm., can in the tire 2 with thickness Tm for below 4.0mm la m 6b
Suitably ensure outer layer 6a thickness.The sidewall 6 has well resistance to traumatic.From this viewpoint, more preferably thickness Tm
It is below 3.5mm.
In fig. 2, two arrow Hf are the radial direction height untill the second end 42 of pad glue 16 from tyre bead baseline BBL.
It is preferred that poor (Hp-Hf) is more than 6.0mm.In the tire 2 that poor (Hp-Hf) is more than 6.0mm, end and the return portion of glue 16 are padded
38 outboard end 44 is sufficiently separated.Thus, the part that deformation concentrates on tyre bead 10 is effectively suppressed.This helps to realize tyre bead 10
Part good durability.From this viewpoint, more preferably poor (Hp-Hf) is more than 7.0mm.
It is preferred that poor (Hp-Hf) is below 14.0mm.The pad glue 16 that poor (Hp-Hf) is below 14.0mm effectively strengthens carcass
Casing ply 34.This contributes to the good durability for realizing the part of tyre bead 10.From this viewpoint, it is more preferably poor (Hp-Hf)
It is below 12.0mm.
Preferred ratio (Hp/Hr) is more than 2.0.Ratio (Hp/Hr) is that more than 2.0 return portion 38 prevents casingply
34 offset around tyre bead 10.This contributes to the good durability for realizing the part of tyre bead 10.From this viewpoint, more preferably ratio
(Hp/Hr) it is more than 2.5.
Preferred ratio (Hp/Hr) is less than 4.0.In the return portion 38 that ratio (Hp/Hr) is less than 4.0, can more have
Effect ground suppresses the generation in the deformation of its leading section.This contributes to the good durability for realizing the part of tyre bead 10.From the sight
Point sets out, and more preferably ratio (Hp/Hr) is less than 3.5.
It is preferred that loss tangent value LTi is less than 0.05.In the la m 6b that loss tangent value LTi is less than 0.05, energy
Enough reduce energy loss.Relatively low rolling resistance can be realized in the tire 2.From this viewpoint, more preferably loss tangent
Value LTi is less than 0.04.
It is preferred that loss tangent value LTi is more than 0.02.Loss tangent value LTi is more than 0.02 la m 6b tyre bead 10
Part be able to maintain that excellent durability.The tire 2 maintains higher durability.
It is preferred that loss tangent value LTo is less than 0.10.It is being less than 0.10 outer layer 6a with loss tangent value LTo
In tire 2, energy loss can be reduced.Relatively low rolling resistance can be realized in the tire 2.From this viewpoint, lose
Tangent value LTo is more preferably less than 0.09.It is preferred that loss tangent value LTo is more than 0.05.Loss tangent value LTo is more than 0.05
Outer layer 6a can fully absorb the impact from road surface.The taking sense of the tire 2 is excellent.From this viewpoint, more preferably
Loss tangent value LTo is more than 0.06.
It is preferred that la m 6b complex modulus Ei*It is more than 2MPa.Complex modulus Ei*It is more than 2MPa la m
6b can reduce la m 6b complex modulus Ei*With outer layer 6a complex modulus Eo*Difference.In the tire 2, when
When applying load to tire 2, the deformation of la m 6b and outer layer 6a boundary can be reduced.From this viewpoint, it is more excellent
Select complex modulus Ei*It is more than 2.5MPa.It is preferred that complex modulus Ei*It is below 5MPa.In complex modulus Ei*It is 5MPa
In following la m 6b, the rigidity of sidewall can be made appropriate.The taking sense and control stability of the tire 2 are excellent.
It is preferred that outer layer 6a complex modulus Eo*It is more than 3MPa.Complex modulus Eo*It is more than 3MPa outer layer
6a excellent in te pins of durability.From this viewpoint, more preferably complex modulus Eo*It is more than 4MPa.It is preferred that complex modulus Eo*It is
Below 15MPa.With complex modulus Eo*Be below 15MPa outer layer 6a tire 2 in, can suitably adjust sidewall
The rigidity in portion.The taking sense and control stability of the tire 2 are excellent.
In the present invention, the size and angle of each part of tire 2 and tire 2 are in regular wheel rim is assembled into and to wheel
Air is filled in tire 2 to determine in the state of causing tire 2 to turn into regular internal pressure.Not to the imposed load of tire 2 during measure.
In this specification, regular wheel rim refers to the wheel rim determined in the standard of 2 foundations of tire." standard wheels in JATMA standards
In rim ", TRA standards " in Design Rim " and ETRTO standards " Measuring Rim " are regular wheel rims.In this theory
In bright book, regular internal pressure refers to the internal pressure determined in the standard of 2 foundations of tire." highest tire pressure ", periodical in JATMA standards
Be loaded in TRA standards " in TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES " " most
In big value " and ETRTO standards " INFLATION PRESSURE " are regular internal pressures.In this manual, regular load is
Refer to the load determined in the standard of 2 foundations of tire." highest load capacity ", publication in JATMA standards is in TCa standards
" " maximum " and ETRTO in TIRE LOAD LIMITS AT VARIOUS COLD INFLATION PRESSURES "
In standard " LOAD CAPACITY " are regular load.
Embodiment
Specify that by the following examples the present invention effect, but not should the record based on the embodiment come limited interpretation
The present invention.
[embodiment 1]
Obtain the tire of the embodiment 1 with the structure shown in Fig. 1.The size of tire is 11R22.5.Shown in table 1
The specification of the tire.Though not shown in table, in the tire, if thickness Te is 4.0mm, thickness Tm is 3.0mm.The tire institute
The height Hr of the flange of the wheel rim of installation is 12.7mm.
[comparative example 1]
Obtain the tire of the comparative example 1 of specification as shown in table 1.This is that sidewall has outer layer and la m, la m
The tire of the part of tyre bead is not extended to.
[embodiment 2]
In addition to change height Hp makes ratio (Hp/Hr) turn into the value shown in table 1, similarly to Example 1, so as to obtain
Obtain the tire of embodiment 2.
[embodiment 3-6 and comparative example 2-3]
In addition to change height Hi makes ratio (Hi/Hr) turn into the value shown in table 2, similarly to Example 1, so as to obtain
Obtain embodiment 3-6 and comparative example 2-3 tire.In comparative example 2, because the medial extremity of la m reaches tyre bead baseline BBL's
Inner side, therefore this is than for negative.In embodiment 6, because the medial extremity of la m extends only to the outboard end of return portion, therefore
Thickness Ti is 0.0mm.
[embodiment 7-8 and comparative example 4-5]
In addition to change and height Ho make ratio (Ho/Hr) turn into the value shown in table 3, similarly to Example 1, so as to obtain
Obtain embodiment 7-8 and comparative example 4-5 tire.
[embodiment 9-14]
In addition to thickness Ti is turned into the value shown in table 4, similarly to Example 1, so as to obtain embodiment 9-14 wheel
Tire.
[embodiment 16-19]
In addition to change height Hf makes poor (Hp-Hf) to turn into the value shown in table 5, similarly to Example 1, so as to obtain
Embodiment 16-19 tire.
[embodiment 15]
In addition to change height Hp makes ratio (Hp/Hr) turn into the value shown in table 5, similarly to Example 16, so that
Obtain the tire of embodiment 15.
[embodiment 20-22 and comparative example 6]
In addition to loss tangent value LTi is turned into the value shown in table 6, similarly to Example 1, so as to obtain embodiment
20-22 and comparative example 6 tire.
[rolling resistance]
Using rolling resistance machine, rolling resistance is determined under following condition determinations.
Use wheel rim：7.50×22.5
Internal pressure：800kPa
Load：29.42kN
Speed：80km/h
The result is to be shown to comparative example 1 for 100 exponential quantity in following tables 1 to 6.Numerical value is smaller, rolls resistance
Power is smaller, represents that burnup performance is more excellent.Numerical value is smaller more preferred.
[durability evaluation]
On the durability of bead part, resistance to tyre bead have rated damaging, resistance to traumatic, resistance to anti-thread breakage and wear-resistant
Property.Their evaluation method is as follows.
[resistance to tyre bead is damaging to be evaluated]
Trial-production tire is assembled into regular wheel rim (7.50 × 22.5), and fills air into the tire and turns into regular
Internal pressure.The tire is installed on drum-type traveling test machine, and 3 times of the longitudinal direction equivalent to regular load is applied with to tire
Load.The tire is set to be travelled with 80km/h speed on roller.Determine untill being damaged on the tyre bead in tire
Time.The result is to be shown to comparative example 1 for 100 exponential quantity in following tables 1 to 6.Numerical value is more big more preferred.
[resistance to traumatic evaluation]
Trial-production tire is assembled into regular wheel rim (7.50 × 22.5), and fills air into the tire and turns into regular
Internal pressure.The tire is installed on vehicle, and regular load is applied to tire.Make the test road that the vehicle is pitch on its road surface
Travelled on road.When travelled until the wheel rim (groove depth is 14mm) for being arranged at tyre surface it is completely worn out untill after, determine sidewall
On wound quantity and size.The resistance to wound performance obtained according to the result to comparative example 1 for 100 index in following tables
Shown in 1-6.The numerical value is more big better.
[resistance to anti-thread breakage evaluation]
Make vehicle after being travelled under the same conditions with resistance to traumatic evaluation, determine the boundary bit of sidewall and chafer
Put the size of the crackle at place.The resistance to crack performance obtained according to the result to comparative example 1 for 100 index in table 1 below -6
In show.The numerical value is more big better.
[wear resistance evaluation]
After vehicle is being travelled under the same conditions with resistance to traumatic evaluation, determine the tire and contacted with rim flange
Part wearing depth.The inverse of the value is shown to comparative example 1 for 100 exponential quantity in table 1 below -6.The numerical value is got over
It is big better.
The evaluation result of table 1
The evaluation result of table 2
The evaluation result of table 3
The evaluation result of table 4
The evaluation result of table 5
The evaluation result of table 6
As shown in table 1-6, in the tire of the present invention, it can be cut down in the state of good durability is maintained and roll resistance
Power.The superiority of the present invention is specify that according to the evaluation result.
Industrial applicability
The tire of the present invention can be installed on various vehicles.
Claims (7)
1. a kind of pneumatic tire, it has：
Tyre surface, its outer surface constitutes tread surface；A pair of sidewall, they are big from the end of above-mentioned tyre surface towards radial direction respectively
Inner side is caused to extend；Chafer, it is respectively on the inside of the radial direction on above-mentioned sidewall；A pair of bead, they are located at upper respectively
State the axially inner side of chafer；And carcass, its be set up in along on the inside of above-mentioned tyre surface and above-mentioned sidewall the tyre bead of a side with
Between the tyre bead of the opposing party,
Above-mentioned sidewall has the la m of outer layer and the axially inner side positioned at the outer layer,
The loss tangent value LTi of above-mentioned la m is smaller than the loss tangent value LTo of above-mentioned outer layer,
The complex modulus Ei of above-mentioned la m*Than the complex modulus Ec of above-mentioned chafer*It is small,
Above-mentioned carcass has casingply,
Above-mentioned casingply is turned back around above-mentioned tyre bead from axially inner side towards outside, thus, the shape on above-mentioned casingply
Into having principal part and return portion,
When the tire is assembled into wheel rim, when setting in the radial direction from tyre bead baseline BBL untill the outboard end of the wheel rim
Height be Hr, if from height of the above-mentioned tyre bead baseline BBL untill the medial extremity of above-mentioned la m be Hi when, above-mentioned height Hi
It is more than 0.0 and less than 3.0 with the ratio between above-mentioned height Hr (Hi/Hr),
When setting the medial extremity on border of above-mentioned outer layer and above-mentioned chafer as Po, in the radial direction, above-mentioned medial extremity
The position consistency of the outboard end of Po position and above-mentioned wheel rim or than above-mentioned wheel rim outboard end position in the outer part, it is above-mentioned in
Side Po position and the position consistency or more inner than the position of the outboard end of above-mentioned return portion of the outboard end of above-mentioned return portion
Side.
2. pneumatic tire according to claim 1, wherein,
The ratio between above-mentioned height Hi and above-mentioned height Hr (Hi/Hr) is less than 1.5.
3. pneumatic tire according to claim 1 or 2, wherein,
When the imaginary line that the radial direction outboard end set from above-mentioned return portion is drawn vertically is Lp, measured along imaginary line Lp
The thickness Ti of above-mentioned la m be more than 2mm and below 5mm.
4. pneumatic tire according to any one of claim 1 to 3, wherein,
The pneumatic tire also has the pad glue turned back around above-mentioned tyre bead in the outside of above-mentioned carcass, and the pad glue, which has, is located at above-mentioned tire
The first end of the axially inner side of circle and the second axially external end positioned at above-mentioned tyre bead, when set from tyre bead baseline BBL to this
When radial direction untill two ends is highly Hf, above-mentioned height Hp and height Hf difference (Hp-Hf) be more than 6mm and 14mm with
Under.
5. pneumatic tire according to any one of claim 1 to 4, wherein,
The ratio between above-mentioned height Hp and above-mentioned height Hr (Hp/Hr) is more than 2 and less than 4.
6. pneumatic tire according to any one of claim 1 to 5, wherein,
The loss tangent value LT1 of above-mentioned la m is more than 0.02 and less than 0.05.
7. pneumatic tire according to any one of claim 1 to 6, wherein,
The complex modulus E1 of above-mentioned la m*It is more than 2MPa and below 5MPa.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016-018040 | 2016-02-02 | ||
| JP2016018040A JP6724396B2 (en) | 2016-02-02 | 2016-02-02 | Pneumatic tire |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107020894A true CN107020894A (en) | 2017-08-08 |
| CN107020894B CN107020894B (en) | 2020-11-06 |
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ID=57737669
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611167669.5A Active CN107020894B (en) | 2016-02-02 | 2016-12-16 | Pneumatic tire |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US10857838B2 (en) |
| EP (1) | EP3202595B1 (en) |
| JP (1) | JP6724396B2 (en) |
| CN (1) | CN107020894B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110116587A (en) * | 2018-02-07 | 2019-08-13 | 住友橡胶工业株式会社 | Pneumatic tire |
| CN110341382A (en) * | 2019-07-22 | 2019-10-18 | 三角轮胎股份有限公司 | Meridian aviation tyre |
| US11999200B2 (en) | 2018-11-02 | 2024-06-04 | The Yokohama Rubber Co., Ltd. | Pneumatic tire |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7115226B2 (en) * | 2018-11-02 | 2022-08-09 | 横浜ゴム株式会社 | pneumatic tire |
| WO2020179347A1 (en) * | 2019-03-01 | 2020-09-10 | 住友ゴム工業株式会社 | Pneumatic tire |
| JP2022014300A (en) * | 2020-07-06 | 2022-01-19 | 住友ゴム工業株式会社 | Pneumatic tire |
| JP2023068958A (en) * | 2021-11-04 | 2023-05-18 | 住友ゴム工業株式会社 | pneumatic tire |
| KR20230155153A (en) * | 2022-05-03 | 2023-11-10 | 한국타이어앤테크놀로지 주식회사 | Tires with bead parts to improve lateral stiffness and durability |
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Also Published As
| Publication number | Publication date |
|---|---|
| US20170217257A1 (en) | 2017-08-03 |
| EP3202595B1 (en) | 2019-03-13 |
| US10857838B2 (en) | 2020-12-08 |
| JP2017136910A (en) | 2017-08-10 |
| EP3202595A1 (en) | 2017-08-09 |
| JP6724396B2 (en) | 2020-07-15 |
| CN107020894B (en) | 2020-11-06 |
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